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<title>Petit FatFs - FATFS</title>
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<div class="para">
<h2>FATFS</h2>
<p>The <tt>FATFS</tt> structure holds dynamic work area of the logical drive and a file. It is given by application program and registerd to the Petit FatFs module with pf_mount function. There is no member that can be changed by application programs.</p>
<pre>
typedef struct {
    BYTE    fs_type;     <span class="c">/* FAT sub type */</span>
    BYTE    csize;       <span class="c">/* Number of sectors per cluster */</span>
    BYTE    flag;        <span class="c">/* File status flags */</span>
    BYTE    pad1;
    WORD    n_rootdir;   <span class="c">/* Number of root directory entries (0 on FAT32) */</span>
    CLUST   n_fatent;    <span class="c">/* Number of FAT entries (= number of clusters + 2) */</span>
    DWORD   fatbase;     <span class="c">/* FAT start sector */</span>
    DWORD   dirbase;     <span class="c">/* Root directory start sector (Cluster# on FAT32) */</span>
    DWORD   database;    <span class="c">/* Data start sector */</span>
    DWORD   fptr;        <span class="c">/* File read/write pointer */</span>
    DWORD   fsize;       <span class="c">/* File size */</span>
    CLUST   org_clust;   <span class="c">/* File start cluster */</span>
    CLUST   curr_clust;  <span class="c">/* File current cluster */</span>
    DWORD   dsect;       <span class="c">/* File current data sector */</span>
} FATFS;
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